package models

import "time"

// --- Enums (matches DB types) ---
type QuestionType string
const (
	Single   QuestionType = "single"
	Multiple QuestionType = "multiple"
)

type DeliveryType string
const (
	Physical DeliveryType = "physical"
	Digital  DeliveryType = "digital"
)

type PurchaseStatus string
const (
	Pending   PurchaseStatus = "pending"
	Delivered PurchaseStatus = "delivered"
	Cancelled PurchaseStatus = "cancelled"
)

type QRScanType string
const (
	QRReward QRScanType = "reward"
	QRQuiz   QRScanType = "quiz"
	QRShop   QRScanType = "shop"
)

type QRScanSource string
const (
	InApp    QRScanSource = "in_app"
	External QRScanSource = "external"
)

type AdminRole string
const (
	RoleAdmin    AdminRole = "admin"
	RoleOperator AdminRole = "operator"
)

// --- Model Structs ---

type User struct {
	TelegramID    int64     `json:"telegram_id"`
	Username      *string   `json:"username,omitempty"`
	FirstName     *string   `json:"first_name,omitempty"`
	LastName      *string   `json:"last_name,omitempty"`
	PhotoURL      *string   `json:"photo_url,omitempty"`
	StarsBalance  int       `json:"stars_balance"`
	CreatedAt     time.Time `json:"created_at"`
}

type Quiz struct {
	ID                  int       `json:"id"`
	Title               string    `json:"title"`
	Description         *string   `json:"description,omitempty"`
	ImageURL            *string   `json:"image_url,omitempty"`
	RewardStars         int       `json:"reward_stars"`
	HasTimer            bool      `json:"has_timer"`
	TimerPerQuestion    *int      `json:"timer_per_question,omitempty"`
	CanRepeat           bool      `json:"can_repeat"`
	RepeatCooldownHours *int      `json:"repeat_cooldown_hours,omitempty"`
	IsActive            bool      `json:"is_active"`
	CreatedBy           *int64    `json:"created_by,omitempty"`
	CreatedAt           time.Time `json:"created_at"`
	Questions           []Question `json:"questions,omitempty"` // This field is for API responses, not DB storage
}

type Question struct {
	ID         int          `json:"id"`
	QuizID     int          `json:"quiz_id"`
	Text       string       `json:"text"`
	Type       QuestionType `json:"type"`
	Options    []Option     `json:"options"` // Stored as JSONB
	OrderIndex int          `json:"order_index"`
}

type Option struct {
	ID        int    `json:"id"`
	Text      string `json:"text"`
	IsCorrect bool   `json:"is_correct"`
}

type QuizAttempt struct {
	ID            int       `json:"id"`
	UserID        int64     `json:"user_id"`
	QuizID        int       `json:"quiz_id"`
	Score         int       `json:"score"`
	StarsEarned   int       `json:"stars_earned"`
	CompletedAt   time.Time `json:"completed_at"`
	Answers       []UserAnswer `json:"answers"` // Stored as JSONB
	// Additional fields for response
	CorrectAnswers int      `json:"correct_answers"`
	TotalQuestions int      `json:"total_questions"`
}

type Reward struct {
	ID           int          `json:"id"`
	Title        string       `json:"title"`
	Description  *string      `json:"description,omitempty"`
	ImageURL     *string      `json:"image_url,omitempty"`
	PriceStars   int          `json:"price_stars"`
	DeliveryType DeliveryType `json:"delivery_type"`
	Instructions *string      `json:"instructions,omitempty"`
	Stock        int          `json:"stock"`
	IsActive     bool         `json:"is_active"`
	CreatedBy    *int64       `json:"created_by,omitempty"`
	CreatedAt    time.Time    `json:"created_at"`
}

type Purchase struct {
	ID          int            `json:"id"`
	UserID      int64          `json:"user_id"`
	RewardID    int            `json:"reward_id"`
	StarsSpent  int            `json:"stars_spent"`
	PurchasedAt time.Time      `json:"purchased_at"`
	Status      PurchaseStatus `json:"status"`
}

type QRScan struct {
	ID        int          `json:"id"`
	UserID    int64        `json:"user_id"`
	Type      QRScanType   `json:"type"`
	Value     *string      `json:"value,omitempty"`
	ScannedAt time.Time    `json:"scanned_at"`
	Source    QRScanSource `json:"source"`
}

type Admin struct {
	TelegramID int64     `json:"telegram_id"`
	Role       AdminRole `json:"role"`
	Name       *string   `json:"name,omitempty"`
	AddedBy    *int64    `json:"added_by,omitempty"`
	AddedAt    time.Time `json:"added_at"`
}


// --- API Request/Response Structs ---

// TransactionType defines whether stars were earned or spent.
type TransactionType string

const (
	TransactionEarned TransactionType = "earned"
	TransactionSpent  TransactionType = "spent"
)

// Transaction represents a single entry in the user's balance history.
type Transaction struct {
	Type        TransactionType `json:"type"`
	Amount      int             `json:"amount"`
	Description string          `json:"description"`
	CreatedAt   time.Time       `json:"created_at"`
}

// SubmissionRequest defines the structure for a user submitting quiz answers.
type SubmissionRequest struct {
	Answers []UserAnswer `json:"answers"`
}

// UserAnswer defines a single answer provided by the user.
type UserAnswer struct {
	QuestionID int   `json:"question_id"`
	OptionIDs  []int `json:"option_ids"`
}

// GrantStarsRequest defines the structure for an admin to grant stars to a user.
type GrantStarsRequest struct {
	UserID int64 `json:"user_id"`
	Amount int   `json:"amount"`
}

// CanRepeatResponse defines the response for the can-repeat check.
type CanRepeatResponse struct {
	CanRepeat       bool       `json:"can_repeat"`
	NextAvailableAt *time.Time `json:"next_available_at,omitempty"`
}

// QRValidateRequest defines the structure for a QR validation request.
type QRValidateRequest struct {
	Payload string `json:"payload"`
}

// QRValidateResponse defines the structure for a QR validation response.
type QRValidateResponse struct {
	Type string      `json:"type"` // e.g., "REWARD", "OPEN_QUIZ"
	Data interface{} `json:"data"`
}

// GenerateQRCodesRequest defines the structure for generating unique QR codes.
type GenerateQRCodesRequest struct {
	Type  string `json:"type"`  // e.g., "reward", "quiz"
	Value string `json:"value"` // e.g., "50" for reward, "1" for quiz
	Count int    `json:"count"` // Number of codes to generate
}

// QRTokenData represents the data stored for a unique QR token
type QRTokenData struct {
	Type  string `json:"type"`  // "reward", "quiz", "shop"
	Value string `json:"value"` // e.g., "50", "123"
	Used  bool   `json:"used"`  // Whether the token has been used
}

// GenerateQRCodesResponse defines the response for generating QR codes
type GenerateQRCodesResponse struct {
	Tokens []string `json:"tokens"` // List of generated unique tokens
}

// CreateOperatorRequest defines the structure for creating a new operator
type CreateOperatorRequest struct {
	TelegramID int64  `json:"telegram_id"`
	Name       string `json:"name"`
}

// Analytics represents various statistics and metrics for the admin dashboard
type Analytics struct {
	TotalUsers        int `json:"total_users"`
	TotalQuizzes      int `json:"total_quizzes"`
	ActiveQuizzes     int `json:"active_quizzes"`
	TotalRewards      int `json:"total_rewards"`
	ActiveRewards     int `json:"active_rewards"`
	TotalAttempts     int `json:"total_attempts"`
	TotalPurchases    int `json:"total_purchases"`
	TotalQRScans      int `json:"total_qr_scans"`
	StarsDistributed  int `json:"stars_distributed"`
	StarsSpent        int `json:"stars_spent"`
}